I have a Colt 16" HBAR threaded barrel with bayonet lug. The front sight base is F marked and the barrel is stamped 6/00. I bought the barrel new and have shot around 300 rounds through it. It is chromed lined. The barrel is in execellent condition with no scratches and stamped CMP 5.56 NATO 1/9 HBAR. The price is $225 shipped to the lower 48. Please contact me at email@example.com.